Design and Implementation of ALU Using Reversible Decoder Logic

Digital system implemented by using conventional gates or irreversible logics like AND and OR gates dissipates a major amount of energy in the form of bits which gets erased during logical operations. This problem of energy loss can be solving by using reversible logic circuits in place of conventional circuits. The Irreversible logic is replaced by reversible logic to decrease the Power dissipation. Reversible logic functions have emerged as an important research area. Implementing the reversible logic has the advantages of reducing gate counts, garbage outputs as well as constant inputs. In today’s world ALU is one of the very important part of any system having many applications in computers, cell phones, etc. Addition, subtraction operations are realized using reversible by using reversible gates. Reversible decoder is designed using Fredkin gates with minimum Quantum cost.. The proposed method require less complexity, less hardware, minimum number of gates, minimum number of garbage inputs and minimum number of constant inputs than existing methods. The proposed circuits will be simulated using ModelSim simulator and implemented in Xilinx.